18384312 has 32 divisors (see below), whose sum is σ = 46396800. Its totient is φ = 6069984.

The previous prime is 18384307. The next prime is 18384319. The reversal of 18384312 is 21348381.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 18384312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18384319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1012 + ... + 6147.

It is an arithmetic number, because the mean of its divisors is an integer number (1449900).

Almost surely, 2^18384312 is an apocalyptic number.

18384312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18384312 is an abundant number, since it is smaller than the sum of its proper divisors (28012488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18384312 is a wasteful number, since it uses less digits than its factorization.

18384312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7275 (or 7271 counting only the distinct ones).

The product of its digits is 4608, while the sum is 30.

The square root of 18384312 is about 4287.6930860312. The cubic root of 18384312 is about 263.9261731122.

The spelling of 18384312 in words is "eighteen million, three hundred eighty-four thousand, three hundred twelve".